Index: lams_tool_sbmt/src/java/org/lamsfoundation/lams/tool/sbmt/web/controller/AuthoringController.java
===================================================================
diff -u -rf744562c66dd81d53ef8ddf2403368e27c8c646d -r1f0a3f8dced9250951b761c71f7e71c1f1db13ec
--- lams_tool_sbmt/src/java/org/lamsfoundation/lams/tool/sbmt/web/controller/AuthoringController.java	(.../AuthoringController.java)	(revision f744562c66dd81d53ef8ddf2403368e27c8c646d)
+++ lams_tool_sbmt/src/java/org/lamsfoundation/lams/tool/sbmt/web/controller/AuthoringController.java	(.../AuthoringController.java)	(revision 1f0a3f8dced9250951b761c71f7e71c1f1db13ec)
@@ -23,13 +23,6 @@
 
 package org.lamsfoundation.lams.tool.sbmt.web.controller;
 
-import java.lang.reflect.InvocationTargetException;
-import java.util.Date;
-
-import javax.servlet.ServletException;
-import javax.servlet.http.HttpServletRequest;
-import javax.servlet.http.HttpSession;
-
 import org.apache.commons.beanutils.PropertyUtils;
 import org.apache.commons.lang.StringUtils;
 import org.lamsfoundation.lams.tool.ToolAccessMode;
@@ -51,6 +44,12 @@
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestMethod;
 
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpSession;
+import java.lang.reflect.InvocationTargetException;
+import java.util.Date;
+
 /**
  * @author Manpreet Minhas
  * @author Steve Ni
@@ -181,6 +180,7 @@
     // ***********************************************************
     // Private/protected methods
     // ***********************************************************
+
     /**
      * The private method to get content from ActionForm parameters (web page).
      */
@@ -196,7 +196,8 @@
 	content.setReflectOnActivity(authoringForm.isReflectOnActivity());
 	content.setLimitUpload(authoringForm.isLimitUpload());
 	content.setLimitUploadNumber(authoringForm.getLimitUploadNumber());
-	content.setMinLimitUploadNumber(authoringForm.getMinLimitUploadNumber());
+	content.setMinLimitUploadNumber(
+		authoringForm.isMinLimitUpload() ? authoringForm.getMinLimitUploadNumber() : null);
 	content.setUseSelectLeaderToolOuput(authoringForm.isUseSelectLeaderToolOuput());
 	content.setNotifyTeachersOnFileSubmit(authoringForm.isNotifyTeachersOnFileSubmit());
 	return content;
Index: lams_tool_sbmt/src/java/org/lamsfoundation/lams/tool/sbmt/web/form/AuthoringForm.java
===================================================================
diff -u -rf744562c66dd81d53ef8ddf2403368e27c8c646d -r1f0a3f8dced9250951b761c71f7e71c1f1db13ec
--- lams_tool_sbmt/src/java/org/lamsfoundation/lams/tool/sbmt/web/form/AuthoringForm.java	(.../AuthoringForm.java)	(revision f744562c66dd81d53ef8ddf2403368e27c8c646d)
+++ lams_tool_sbmt/src/java/org/lamsfoundation/lams/tool/sbmt/web/form/AuthoringForm.java	(.../AuthoringForm.java)	(revision 1f0a3f8dced9250951b761c71f7e71c1f1db13ec)
@@ -1,9 +1,9 @@
 package org.lamsfoundation.lams.tool.sbmt.web.form;
 
-import javax.servlet.http.HttpServletRequest;
-
 import org.lamsfoundation.lams.tool.sbmt.model.SubmitFilesContent;
 
+import javax.servlet.http.HttpServletRequest;
+
 /**
  * @author Dapeng.Ni
  */
@@ -29,6 +29,8 @@
 
     private boolean limitUpload;
 
+    private boolean minLimitUpload;
+
     private boolean useSelectLeaderToolOuput;
 
     private int limitUploadNumber;
@@ -62,6 +64,7 @@
 	limitUpload = content.isLimitUpload();
 	limitUploadNumber = content.getLimitUploadNumber();
 	minLimitUploadNumber = content.getMinLimitUploadNumber();
+	minLimitUpload = minLimitUploadNumber != null;
 
 	reflectOnActivity = content.isReflectOnActivity();
 	reflectInstructions = content.getReflectInstructions();
@@ -151,6 +154,14 @@
 	this.limitUpload = limitUpload;
     }
 
+    public boolean isMinLimitUpload() {
+	return minLimitUpload;
+    }
+
+    public void setMinLimitUpload(boolean minLimitUpload) {
+	this.minLimitUpload = minLimitUpload;
+    }
+
     public int getLimitUploadNumber() {
 	return limitUploadNumber;
     }
@@ -182,4 +193,4 @@
     public void setUseSelectLeaderToolOuput(boolean useSelectLeaderToolOuput) {
 	this.useSelectLeaderToolOuput = useSelectLeaderToolOuput;
     }
-}
+}
\ No newline at end of file
Index: lams_tool_sbmt/web/authoring/advance.jsp
===================================================================
diff -u -rf744562c66dd81d53ef8ddf2403368e27c8c646d -r1f0a3f8dced9250951b761c71f7e71c1f1db13ec
--- lams_tool_sbmt/web/authoring/advance.jsp	(.../advance.jsp)	(revision f744562c66dd81d53ef8ddf2403368e27c8c646d)
+++ lams_tool_sbmt/web/authoring/advance.jsp	(.../advance.jsp)	(revision 1f0a3f8dced9250951b761c71f7e71c1f1db13ec)
@@ -12,18 +12,18 @@
 		$('.bootstrap-slider').bootstrapSlider();
 		//force slider to show tick labels
 		setTimeout(
-			function(){ 
-				//$(".bootstrap-slider").each(function() {
+				function(){
+					//$(".bootstrap-slider").each(function() {
 					//$(this).bootstrapSlider('relayout');
 					//$(".bootstrap-slider").bootstrapSlider("relayout");
-				//});
+					//});
 
-				$(".bootstrap-slider").bootstrapSlider("relayout");
-			}, 
-			1200
+					$(".bootstrap-slider").bootstrapSlider("relayout");
+				},
+				1200
 		);
-		
-		$('#enable-min-limit').change(function(){
+
+		$('#minLimitUpload').change(function(){
 			//toggle visibility of the slider
 			$('#minLimitUploadNumber').parent().toggleClass('hidden');
 
@@ -54,7 +54,7 @@
 				$('#limitUploadNumber').val(0);
 			}
 		});
-		
+
 		$('#reflectInstructions').keyup(function(){
 			var checked = $(this).val() != null && $(this).val().trim() != '';
 			$('#reflectOnActivity').prop('checked', checked)
@@ -73,23 +73,23 @@
 
 <lams:SimplePanel titleKey="label.file.options">
 	<div class="checkbox">
-		<label for="enable-min-limit">
-			<input type="checkbox" id="enable-min-limit" <c:if test="${authoringForm.minLimitUploadNumber != null}">checked="checked"</c:if>/>
+		<label for="minLimitUpload">
+			<form:checkbox path="minLimitUpload" id="minLimitUpload" />
 			<fmt:message key="label.enable.min.limit" />
 		</label>
 
-		<div class="slider-div <c:if test="${authoringForm.minLimitUploadNumber == null}">hidden</c:if>">
+		<div class="slider-div <c:if test="${!authoringForm.minLimitUpload}">hidden</c:if>">
 			<input name="minLimitUploadNumber" id="minLimitUploadNumber" type="text"
-				class="bootstrap-slider" 
-				data-slider-tooltip="hide"
-				data-slider-ticks="[1, 2, 3, 4, 5]"
-				data-slider-ticks-labels='["1", "2", "3", "4", "5"]'
-				data-slider-lock-to-ticks="true"
-				data-slider-value="${authoringForm.minLimitUploadNumber}"
+				   class="bootstrap-slider"
+				   data-slider-tooltip="hide"
+				   data-slider-ticks="[1, 2, 3, 4, 5]"
+				   data-slider-ticks-labels='["1", "2", "3", "4", "5"]'
+				   data-slider-lock-to-ticks="true"
+				   data-slider-value="${authoringForm.minLimitUploadNumber}"
 			/>
 		</div>
 	</div>
-	
+
 	<div class="checkbox">
 		<label for="limitUpload">
 			<form:checkbox path="limitUpload" id="limitUpload" />
@@ -98,12 +98,12 @@
 
 		<div class="slider-div <c:if test="${!authoringForm.limitUpload}">hidden</c:if>">
 			<input name="limitUploadNumber" id="limitUploadNumber" class="bootstrap-slider" type="text"
-				data-slider-tooltip="hide"
-				data-slider-ticks="[1, 2, 3, 4, 5, 100]"
-				data-slider-ticks-positions="[0, 20, 40, 60, 80, 100]"
-				data-slider-ticks-labels='["1", "2", "3", "4", "5", "100"]'
-				data-slider-lock-to-ticks="true"
-				<c:if test="${authoringForm.limitUpload}">data-slider-value="${authoringForm.limitUploadNumber}"</c:if>
+				   data-slider-tooltip="hide"
+				   data-slider-ticks="[1, 2, 3, 4, 5, 100]"
+				   data-slider-ticks-positions="[0, 20, 40, 60, 80, 100]"
+				   data-slider-ticks-labels='["1", "2", "3", "4", "5", "100"]'
+				   data-slider-lock-to-ticks="true"
+				   <c:if test="${authoringForm.limitUpload}">data-slider-value="${authoringForm.limitUploadNumber}"</c:if>
 			/>
 		</div>
 	</div>
@@ -127,15 +127,15 @@
 			<fmt:message key="label.authoring.advance.lock.on.finished" />
 		</label>
 	</div>
-	
+
 	<div class="checkbox">
 		<label for="reflectOnActivity">
 			<form:checkbox path="reflectOnActivity" id="reflectOnActivity" />
 			<fmt:message key="label.authoring.advanced.reflectOnActivity" />
 		</label>
 	</div>
-	
+
 	<div class="form-group">
 		<form:textarea path="reflectInstructions" id="reflectInstructions" cssClass="form-control" cols="50" rows="4"></form:textarea>
 	</div>
-</lams:SimplePanel>
+</lams:SimplePanel>
\ No newline at end of file